Testing microscopically derived descriptions of nuclear collectivity: Coulomb excitation of Mg-22


Henderson J., Hackman G., Ruotsalainen P., Stroberg S. R., Launey K. D., Holt J. D., ...More

PHYSICS LETTERS B, vol.782, pp.468-473, 2018 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 782
  • Publication Date: 2018
  • Doi Number: 10.1016/j.physletb.2018.05.064
  • Journal Name: PHYSICS LETTERS B
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.468-473
  • Keywords: Mg-22, Ne-22, Ab initio, Collectivity, Coulomb excitation, STATES
  • Eskisehir Osmangazi University Affiliated: No

Abstract

Many-body nuclear theory utilizing microscopic or chiral potentials has developed to the point that collectivity might be studied within a microscopic or ab initio framework without the use of effective charges; for example with the proper evolution of the E2 operator, or alternatively, through the use of an appropriate and manageable subset of particle-hole excitations. We present a precise determination of E2 strength in Mg-22 and its mirror Ne-22 by Coulomb excitation, allowing for rigorous comparisons with theory. No-core symplectic shell-model calculations were performed and agree with the new B(E2) values while in-medium similarity-renormalization-group calculations consistently underpredict the absolute strength, with the missing strength found to have both isoscalar and isovector components. The discrepancy between two microscopic models demonstrates the sensitivity of E2 strength to the choice of many-body approximation employed. (C) 2018 The Author(s). Published by Elsevier B.V.